In January 1994 an oil barge ran aground off the coast of San Juan, Puerto Rico, leaking its cargo of 750000 gallons into the ocean, while causing the pollution of the city’s beaches.

A) leaking its cargo of 750000 gallons into the ocean, while causing the pollution of
B) with its cargo of its cargo of 750000 gallons leaking into the ocean, and it polluted
C) and its cargo of its cargo of 750000 gallons leaked into the ocean, polluting
D) while it leaked its cargo of 750000 gallons into the ocean and caused the pollution of
E) so that its cargo of 750000 gallons leaked into the ocean, and they were polluting

OA is C...why not B?